package io.afu.baseframework.utils;

import jakarta.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * @author RffanLAB.方露宇
 * @version 0.1
 */
public class IpUtils {

    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress="";
        }
        // ipAddress = this.getRequest().getRemoteAddr();

        return ipAddress;
    }

    /**
     * 检查是否是合法的IPv4地址
     * @param unkonwIPv4 未知合法与否的ipv4地址
     * @return 是否合法
     */
    public static boolean isVailedIPv4(String unkonwIPv4) {
        boolean checked = false;
        if (unkonwIPv4 != null && !unkonwIPv4.equals("")){
            // 不为空 开始使用正则检测入参是否是一个合法的IPV4
            String regex = "^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$";
            checked = unkonwIPv4.matches(regex);
        }
        return checked;
    }


    /**
     * 检查是否是合法的IPv4地址
     * @param unkonwIPv6 未知合法与否的ipv6
     * @return 是否合法
     */
    public static boolean isVailedIPv6(String unkonwIPv6) {
        boolean check = false;
        // 检查入参是否为空
        if (unkonwIPv6 != null && !unkonwIPv6.equals("")){
            // 不为空 开始使用正则检测入参是否是一个合法的IPV6
            String regex = "^([\\da-fA-F]{1,4}:){7}[\\da-fA-F]{1,4}$";
            check = unkonwIPv6.matches(regex);
        }
        return check;
    }



}
